If you stumble across a license violation in Debian - be it in
experimental, backports, freeze or oldstable - file a very severe
bugreport about it. Yes, so severe that the issue *must* be dealt with,
and if by no othere means then by removing the package from Debian.
You need not do analysis across the whole distribution - if you find a
single violation then report that single violation. Others might then
look at that single violation and consider "hmm, I wonder if there's a
pattern to this...".
In this thread we are discussing how we can ease avoidance of this kind
of violation, but consequence of us not easing it do not mean other
package maintainers need not care, but that they have a larger burden
caring more manually.